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Analog Devices Inc. LT8619IMSE#PBF
- Part No.:
- LT8619IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8619IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,570
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Product details
Overview
LT8619IMSE#PBF from Analog Devices is a 60V, 1.2A synchronous monolithic buck regulator with 6µA quiescent current in Burst Mode, 30ns minimum on-time, and ±7.5% power-good accuracy. It operates from 3V to 60V input, delivers regulated output via internal compensation and peak-current-mode control, and is used in automotive 12V/24V/48V systems requiring ultra-low IQ and high efficiency at light loads.
For engineers reviewing the LT8619IMSE#PBF datasheet, LT8619IMSE#PBF pinout, LT8619IMSE#PBF application, or LT8619IMSE#PBF equivalent, key selection criteria include ultralow 6µA no-load IQ, 30ns min-on-time for high VIN/VOUT ratios, SYNC-controlled mode selection (Burst/Pulse-Skipping/Forced Continuous), 16-lead MSOP thermal performance (θJA = 40°C/W), and AEC-Q100 qualification for automotive use.
Technical Context
The LT8619IMSE#PBF implements peak-current-mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its oscillator supports resistor-programmable frequency (300kHz–2.2MHz) and external synchronization, while the integrated top/bottom MOSFETs feature 0.45Ω/0.22Ω RDS(ON) and 1.5A/1.8A current limits.
Burst Mode operation shuts down control circuitry between switching bursts to achieve 6µA IQ, while forced continuous mode enables fixed-frequency operation synchronized to an external clock. The EN/UV pin provides accurate 1V threshold with 40mV hysteresis for programmable UVLO or shutdown, and the PG flag asserts when VFB is within ±7.5% of regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Quiescent Current (Burst Mode) | 6µA at 12VIN/3.3VOUT - enables >1-year battery life in always-on automotive modules. |
| Output Current | 1.2A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in embedded systems. |
| Min On-Time | 30ns - allows high step-down ratios (e.g., 48V→3.3V) without pulse-skipping instability. |
| Power Good Accuracy | ±7.5% window - ensures reliable system reset and sequencing in safety-critical applications. |
| Switching Frequency Range | 300kHz to 2.2MHz - permits EMI optimization and compact magnetics design across diverse board layouts. |
| Thermal Resistance (θJA) | 40°C/W - achieved via exposed pad in 16-lead MSOP package, enabling 1.2A operation without forced air. |
Pinout & Package
LT8619IMSE#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND). The exposed pad must be soldered to PCB ground plane for optimal thermal performance (θJA = 40°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 2) | Main input supply | Supplies internal circuitry and top switch; requires local 10µF ceramic bypass to GND. |
| EN/UV (Pin 4) | Enable / UVLO input | 1V rising threshold with 40mV hysteresis; enables programmable input undervoltage lockout or shutdown. |
| RT (Pin 5) | Frequency set resistor | Connects to GND to program switching frequency (300kHz–2.2MHz); no external voltage allowed. |
| PG (Pin 6) | Open-drain Power Good | Asserts high when VFB is within ±7.5% of regulation; requires external pull-up to INTVCC/VOUT. |
| SYNC (Pin 7) | Mode control / sync input | GND = Burst Mode; float = Pulse-Skipping; INTVCC = Forced Continuous; external clock = synchronized FCM. |
| FB (Pin 9,10) | Feedback input | Regulated to 0.8V; connects to resistor divider for adjustable output; 4.7–10pF phase-lead cap required. |
| BIAS (Pin 11) | Bias supply input | Tie to VOUT ≥3.3V to reduce IQ; powers internal LDO and drivers, lowering VIN current draw. |
| INTVCC (Pin 12) | Internal 3.3V LDO output | Supplies control logic and gate drivers; max 20mA; decouple with ≥1µF ceramic to GND. |
| BST (Pin 14) | Bootstrap supply | Drives top MOSFET gate; requires 0.1µF ceramic capacitor between BST and SW pins. |
| SW (Pin 15,16) | Switch node | Connects to inductor and BST capacitor; must be minimized on PCB to reduce EMI and switching losses. |
| GND (Pin 8, Exposed Pad 17) | Power and signal ground | Exposed pad is GND and must be soldered to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 6µA quiescent current | Enables >1-year battery runtime in always-on automotive telematics and ADAS modules. |
| 30ns minimum on-time | Supports direct 48V-to-3.3V conversion without intermediate stages, reducing BOM count and footprint. |
| Internal compensation | Eliminates external compensation components, simplifying layout and improving production yield. |
| AEC-Q100 Grade I qualified | Validated for –40°C to +125°C junction temperature, meeting automotive reliability and lifetime requirements. |
| Low EMI Silent Switcher® architecture | Reduces radiated emissions via symmetrical SW node layout and controlled edge rates, easing EMC certification. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powers display controllers and audio codecs in head units with 12V battery input subject to cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Primary 3.3V/1.2A buck regulator with UVLO, PG signaling, and Burst Mode for low-power standby. Use Value: 6µA IQ extends battery life during vehicle sleep; 60V rating withstands ISO 7637-2 pulses without protection circuitry. | Use Scenario: Supplies wireless sensor nodes in factory automation using 24V DC rails with strict energy budget constraints. IC Role / Device Role / Timing Role: High-efficiency step-down converter delivering 5V/1.2A to MCU and RF transceiver, with programmable frequency for EMI compliance. Use Value: 92% efficiency at 0.5A reduces thermal load in sealed enclosures; SYNC pin enables spread-spectrum synchronization with host controller clock. |
| 48V Mild Hybrid Vehicle ECUs | Medical Portable Diagnostic Equipment |
Use Scenario: Provides 5V bias to CAN FD transceivers and microcontrollers in 48V onboard chargers and DC-DC converters. IC Role / Device Role / Timing Role: Input-capable buck regulator operating from 36–58V nominal range, with 30ns min-on-time for stable 5V output. Use Value: 30ns min-on-time avoids pulse-skipping at full load under worst-case VIN/VOUT ratio; AEC-Q100 qualification ensures field reliability. | Use Scenario: Powers FPGA-based imaging subsystems in portable ultrasound devices requiring quiet, low-noise 3.3V supply. IC Role / Device Role / Timing Role: Low-ripple, low-EMI buck regulator with Burst Mode for battery-powered operation and forced continuous mode for imaging acquisition. Use Value: 10mVP-P output ripple in Burst Mode prevents noise coupling into analog front-end; MSOP package fits space-constrained handheld form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640SIMSE#PBF | Higher 4A output, 2.2MHz max fSW, same 6µA IQ, but larger 20-lead MSE package and higher cost. | Required where >1.2A load current or faster transient response is needed; not drop-in due to pinout and package change. | Select when scaling power delivery beyond 1.2A while retaining ultralow IQ and automotive qualification. |
| MPQ4420AGL-A-Z | 3.5A output, 2.2MHz fSW, 17µA IQ, QFN-10 package, no SYNC pin or PG flag, non-AEC-Q100. | Suitable for cost-sensitive industrial supplies where PG signaling and automotive qualification are unnecessary. | Choose for high-current, non-automotive applications where 6µA IQ and PG are not required, accepting higher quiescent current and reduced feature set. |
Compared with LT8640SIMSE#PBF and MPQ4420AGL-A-Z, the LT8619IMSE#PBF uniquely balances 1.2A capability, 6µA IQ, AEC-Q100 qualification, and 16-pin MSOP footprint-making it optimal for space- and power-constrained automotive modules where full 4A capability is unnecessary.
Availability
LT8619IMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, 48V hybrid vehicle ECUs, industrial sensor nodes, and portable medical diagnostics requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8619IMSE#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8619IMSE#PBF belongs to the Silent Switcher® monolithic buck regulator product line, engineered specifically for automotive and industrial applications demanding ultralow quiescent current, wide input voltage range, and robust EMI performance.
FAQ
What is the guaranteed operating junction temperature range for the LT8619IMSE#PBF?
The LT8619IMSE#PBF is guaranteed to operate over a junction temperature range of –40°C to +125°C. This specification applies to the "I" grade variant, which is validated across the full range via characterization and statistical process controls-not just derated from typical conditions. The LT8619IMSE#PBF's exposed-pad MSOP package enables reliable thermal dissipation within this range when properly soldered to a PCB ground plane.
Does the LT8619IMSE#PBF support fixed 5V output without external feedback resistors?
No-the LT8619IMSE#PBF is the standard adjustable version with FB pin; it requires an external resistor divider to set output voltage. For fixed 5V output, Analog Devices offers the LT8619-5 variants (e.g., LT8619IMSE-5#PBF), which integrate a 10MΩ internal feedback divider and use the OUT pin instead of FB. The LT8619IMSE#PBF itself does not provide fixed 5V regulation.
How does the SYNC pin affect operating mode and quiescent current in the LT8619IMSE#PBF?
The SYNC pin configures three distinct modes in the LT8619IMSE#PBF: grounding it enables Burst Mode (6µA IQ), floating it enables Pulse-Skipping Mode (~10µA IQ), and connecting it to INTVCC enables Forced Continuous Mode (3mA IQ). Each mode trades off light-load efficiency against output ripple and EMI profile-Burst Mode maximizes battery life, while Forced Continuous Mode ensures fixed-frequency operation for EMI filtering.
Can the LT8619IMSE#PBF be used with input voltages below 3V?
No-the absolute minimum input voltage for the LT8619IMSE#PBF is 3.0V, as specified in the Electrical Characteristics table. Operation below 3V is not guaranteed and may result in failure to regulate, premature UVLO shutdown, or undefined behavior. For sub-3V inputs, alternative regulators such as the LT8609 or LTC3639 should be evaluated.
What is the purpose of the BIAS pin on the LT8619IMSE#PBF, and how should it be connected?
The BIAS pin on the LT8619IMSE#PBF supplies current to the internal LDO and gate drivers. When tied to VOUT ≥3.1V (e.g., 3.3V or 5V), it reduces input supply current and improves efficiency. If left unconnected or tied to <3.1V, the IC draws bias current from VIN-increasing total IQ. A 1µF ceramic capacitor must be placed locally between BIAS and GND if connected to an external supply.
LT8619IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 59.4V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 300kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8619IMSE#PBF FAQ
1.How can I place an order for LT8619IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8619IMSE#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8619IMSE#PBF reliable?
The price and inventory of LT8619IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8619IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8619IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8619IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8619IMSE#PBF?
LT8619IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8619IMSE#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8619IMSE#PBF?
For technical support, including LT8619IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8619IMSE#PBF requirements.
6.How does Aetrix verify that LT8619IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8619IMSE#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8619IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8619IMSE#PBF?
All LT8619IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8619IMSE#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8619IMSE#PBF part is unused and in its original packaging.
Return procedure for LT8619IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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